/**
 * ICONDEMO.c -- Icon Demonstration Program
 *              (c) Charles Petzold, 1998
 */

#include <windows.h>
#include "resource.h"

#define ID_LIST 1
#define ID_TEXT 2

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    static TCHAR szAppName[] = TEXT("IconDemo");
    HWND hwnd;
    MSG msg;
    WNDCLASS wndclass;

    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL, MAKEINTRESOURCE(IDI_ICON));
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = szAppName;

    if (!RegisterClass(&wndclass))
    {
        MessageBox(NULL, TEXT("This program requires Windows NT!"), szAppName, MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(szAppName, 
                        TEXT("Environment List Box"),
                        WS_OVERLAPPEDWINDOW,
                        CW_USEDEFAULT, CW_USEDEFAULT, 
                        600, 600,
                        NULL, NULL, hInstance, NULL);
    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static HICON hIcon;
    static int cxIcon, cyIcon, cxClient, cyClient;
    HDC hdc;
    HINSTANCE hInstance;
    PAINTSTRUCT ps;
    int x, y;

    switch (message)
    {
        case WM_CREATE: {
            hInstance = ((LPCREATESTRUCT)lParam)->hInstance;
            hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON));
            cxIcon = GetSystemMetrics(SM_CXICON);
            cyIcon = GetSystemMetrics(SM_CYICON);
            return 0;
        }
        case WM_SETFOCUS: {
            // SetFocus(hwndList);
            return 0;
        }
        case WM_SIZE: {
            // MoveWindow(hwndEdit, 0, 0, LOWORD(lParam), HIWORD(lParam), TRUE);
            cxClient = LOWORD(lParam);
            cyClient = HIWORD(lParam);
            return 0;
        }
        case WM_COMMAND: {
            return 0;
        }
        // case WM_DRAWITEM: {return 0;}

        
        case WM_PAINT: {
            hdc = BeginPaint(hwnd, &ps);
            for (y=0; y<cyClient; y+=cyIcon) {
                for (x=0; x<cxClient; x+= cxIcon) {
                    DrawIcon(hdc, x, y, hIcon);
                }
            }
            EndPaint(hwnd, &ps);
            return 0;
        }
       
        case WM_DESTROY: {
            PostQuitMessage(0);
            return 0;
        } 
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}